Gas burner operating system

ABSTRACT

A gas burner operating system includes a control unit installed in the body of a gas burner and connected to an electronic igniter in the body of the gas burner, the operating unit using a cock, a pressure differential device, a medium flowrate control valve and a low flowrate control valve to control the operation of the gas burner and the intensity of the burner flame, and an operating unit provided outside the body of the gas burner for enabling the user to control the operation of the control unit and the electronic igniter of the gas burner at a remote place away from the gas burner.

BACKGROUND OF THE INVENTION

[0001] The present invention relates to gas burners and, more particularly, to a gas burner operating system, which uses a differential pressure device to control the fuel passage from the fuel gas source to the burner flame nozzle tube, and normal-close and normal-open valve means to control the fuel passage from the fuel gas source to the ignition flame nozzle for producing an ignition flame for burning fuel gas from the burner flame nozzle tube.

[0002] Regular gas burners commonly use a piezoelectric ignition switch (cork) to control the ignition of fuel gas and the intensity of the flame. When in use, the user must hold the piezoelectric ignition switch in the depressed position after the presence of the ignition flame, and then release the piezoelectric ignition switch after the presence of the desired main flame. In case the main flame and/or the igniting flame is extinguished by wind or an accident, the user must depress the piezoelectric ignition switch and then rotate it from the off-position to the on-position again to ignite the ignition flame so as to further ignite the main flame.

SUMMARY OF THE INVENTION

[0003] The invention has been accomplished to provide a gas burner operating system, which eliminates the drawbacks of the conventional gas burners.

[0004] It is one object of the present invention to provide a gas burner, which is easy and efficient in use.

[0005] It is another object of the present invention to provide a gas burner, which prevents a fuel gas leakage when the main flame is extinguished accidentally.

[0006] It is still another object of the present invention to provide a gas burner, which is automatically controlled to keep the ambient temperature within the desired range.

[0007] According to the present invention, the gas burner operating system comprises a control unit installed in the body of a gas burner and connected to an electronic igniter in the body of the gas burner, and an operating unit provided outside the body of the gas burner and respectively connected to the control unit and the electronic igniter. The control unit comprises a valve seat supported in the body of the gas burner, and a cock, a pressure differential device, a medium flowrate control valve and a low flowrate control valve respectively supported in the valve seat. The cock is connected to an external gas source, and adapted to regulate the flowrate of fuel gas passing through as well as to control a micro-switch, which controls the connection of power supply to the electronic igniter. The pressure differential device comprises a first shell and a second shell coupled to each other face-to-face, a normal-open valve supported in the second shell, a normal-close valve supported in the second shell and electrically connected to the electronic igniter, a rubber diaphragm positioned in between the first shell and the second shell and supported on a pressure spring, a diaphragm valve coupled to the rubber diaphragm, a first pressure chamber defined between the first shell and the rubber diaphragm, a second pressure chamber defined between the second shell and the rubber diaphragm, and an output port disposed in communication between the first pressure chamber and the valve seat for output of fuel gas. The diaphragm valve is adapted to close/open the output port. The operating unit comprises a power switch, a linkage switch formed of a high flame control switch and a medium flame control switch, and a low flame control switch. The power switch is connected to a common contact of the micro-switch and the electronic igniter. The micro-switch has a normal-open terminal connected the electronic igniter. The high flame control switch is electrically connected to the normal-open valve, and adapted to close/open the normal-open valve. The medium flame control switch is electrically connected to the medium flowrate control valve, and adapted to close/open the medium flowrate control valve. The low flame control switch is electrically connected to the low flowrate control valve, and adapted to close/open the low flowrate control valve.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008]FIG. 1 illustrates a gas burner operating system installed in a gas burner under wire-control operation arrangement according to the present invention.

[0009]FIG. 2 illustrates a gas burner operating system installed in a gas burner under a wireless control arrangement according to the present invention.

[0010]FIG. 3 illustrates the arrangement of the gas burner operating system according to a first embodiment of the present invention.

[0011]FIG. 4 is similar to FIG. 3 but showing the power switch switched on, the cock rotated to the open position.

[0012]FIG. 5 is similar to FIG. 4 but showing the high flame control switch switched on, the high flowrate control valve opened.

[0013]FIG. 6 is similar to FIG. 4 but showing the medium flame control switch switched on, the medium flowrate control valve opened.

[0014]FIG. 7 is similar to FIG. 4 but showing the low flame control switch switched on, the low flowrate control valve opened.

[0015]FIG. 8 is similar to FIG. 3 but showing the medium (low) flowrate control valve eliminated from the gas burner operating system.

[0016]FIG. 9 illustrates the arrangement of the gas burner operating system according to a second embodiment of the present invention.

[0017]FIG. 10 is similar to FIG. 9 but showing the power switch switched on, the cock rotated to the open position.

[0018]FIG. 11 is similar to FIG. 10 but showing the high flame control switch switched on, the high flowrate control valve opened.

[0019]FIG. 12 is similar to FIG. 10 but showing the medium flame control switch switched on, the medium flowrate control valve opened.

[0020]FIG. 13 is similar to FIG. 10 but showing the low flame control switch switched on, the low flowrate control valve opened.

[0021]FIG. 14 is similar to FIG. 9 but showing the medium (low) flowrate control valve eliminated from the gas burner operating system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Referring to FIG. 1, a gas burner in accordance with a first embodiment of the present invention is generally comprised of a control unit 1 and an operating unit 2. The control unit 1 is installed in the body 8 of the gas burner and connected to an electronic igniter 9 in the body 8. The operating unit 2 is provided outside the body 8 of the gas burner, for example, mounted on the wall and respectively connected to the control unit 1 and the electronic igniter 9. The user can ignite the gas burner and regulate the flame through the control unit 1 as well as regulate the flame through the operating unit 2.

[0023] Referring to FIG. 3, the control unit 1 comprises a valve seat 3 supported in the body 8 to hold a cock 4, a pressure differential device 5, a medium flowrate control valve 6 and a low flowrate control valve 7. The cock 4 is adapted to close/open the gas passage and to regulate the flowrate of fuel gas passing through, as well as to control a micro-switch 45, which controls the connection of power supply to the electronic igniter 9, so as to achieve ignition and flame regulation functions, having a gas inlet 41 and a gas outlet 42. The valve seat 3 comprises a gas inlet 31 connected to the gas outlet 42 of the cock 4, and a gas outlet 32 connected to the burner flame nozzle tube 82 through a main gas pipe 81. A gas hole 33 is connected between the valve seat 3 and the pressure differential device 5. Wire gauze filters 34 and 43 are respectively installed in the air hole 33 and the gas inlet 41 of the cock 4 to remove solid particles from fuel gas passing through. The pressure differential device 5 comprises a first shell 51 and a second shell 52 coupled to each other face-to-face, a normal-open valve 53 supported in the second shell 52 and electrically connected to a high flame control switch 22 of the operating unit 2, a normal-close valve 54 supported in the second shell 52 and electrically connected to the electronic igniter 9, a rubber diaphragm 56 positioned in between the first shell 51 and the second shell 52 and supported on a pressure spring 5, a valve 57 coupled to the rubber diaphragm 56, a first pressure chamber 58 defined between the first shell 51 and the rubber diaphragm 56, and a second pressure chamber 59 defined between the second shell 52 and the rubber diaphragm 56. The valve 57 is adapted to close/open the output port 50 of the first pressure chamber 58 and the internal fuel gas passage 35 of the valve seat 3. The medium flowrate control valve 6 is adapted to control the fuel gas passage to the burner flame nozzle tube 82, for enabling a medium flowrate of fuel gas to be discharged out of the burner flame nozzle tube 82 for burning. The low flowrate control valve 7 is adapted to control the fuel gas passage to the burner flame nozzle tube 82, for enabling a low flowrate of fuel gas to be discharged out of the burner flame nozzle tube 82 for burning.

[0024] The normal-open valve 53, the normal-close valve 54, the medium flowrate control valve 6 and the low flowrate control valve 7 are electrically controlled solenoid valves, and the medium flowrate control valve 6 and the low flowrate control valve 7 are normally closed, i.e., when power supply is off, the respective contacts are disconnected, and the respective valve plugs 61˜63 are closed; when power supply is on, the respective contacts are connected, and the respective valve plugs 61˜63 are opened for letting fuel gas to pass. The valve plug 60 of the normal-open valve 53 is maintained in the open position for letting fuel gas to pass when power supply is connected, or in the close position to stop fuel gas from passing through when power supply is disconnected. The cock 4, the pressure differential device 5 and the solenoid valves 6;7 are of the known art, no further detailed description is needed.

[0025] The solenoid valves 53;54;6;7 let fuel gas pass at different flowrate. In order to facilitate fabrication, the solenoid valves have same structure, and gas tubes of different inner diameters are provided in the solenoid valves to fit different flowrate requirements, for example, the gas tube 64 installed in the normal-open valve 53 has the inner diameter of 5 mm, the gas tube 65 installed in the medium flowrate control valve 6 has the inner diameter of 3.5 mm, and the gas tube 66 installed in the low flowrate control valve 7 has the inner diameter of 2 mm. Because the normal-close valve 54 has nothing to do with the intensity of the flame, it is not necessary to install a gas tube in the normal-close valve 54. By means of installing different gas tubes 64˜66, the fuel gas output flowrate of the solenoid valves 53;6;7 are relatively changed. Therefore, solenoid valves of a particular specification can be used to fit the requirement. Further, O-rings 67˜69 are respectively fastened to the outside wall of the gas tubes 64˜66 to seal the gap between the respective gas tubes 64˜66 and the respective solenoid valves 53;6;7, preventing a fuel gas leakage. Alternatively, changing the inner diameter of the gas tubes 37˜39 in the gas outlet of the normal-open valve 53 and the gas inlets of the medium flowrate control valve 6 and the low flowrate control valve 7 achieves the same effect.

[0026] Referring to FIG. 3, the operating unit 2 comprises an indicator light 20, a power switch 21, a high flame control switch 22, a medium flame control switch 23, and a low flame control switch 24. A control circuit (not shown) is installed in the operating unit 2 and connected to a battery 91, which provides the necessary working voltage to the electronic ignition switch 9. When battery low, the control circuit turns on the indicator light 20, informing the user to replace the battery 91. The power switch 21 is connected to the common contact of the micro-switch 45 and the electronic igniter 9. When rotating the cock 4 to switch on the micro-switch 45 after the power switch 21 has been pressed on, electricity is connected to the electronic igniter 9. The further procedure will be described further. The high flame control switch 22 is electrically connected to the normal-open valve 53, and adapted to close/open the normal-open valve 53. The medium flame control switch 23 is electrically connected to the medium flowrate control valve 6, and adapted to close/open the medium flowrate control valve 6. The low flame control switch 24 is electrically connected to the low flowrate control valve 7, and adapted to close/open the low flowrate control valve 7. Further, the high flame control switch 22, the medium flame control switch 23 and the low flame control switch 24 are linked to one another, forming a linkage switch 25, such that the medium flame control switch 23 and the low flame control switch 24 are automatically returned to off position when the high flame control switch 22 is on; the high flame control switch 22 and the low flame control switch 24 are automatically returned to off position when the medium flame control switch 23 is on; the high flame control switch 22 and the medium flame control switch 23 are automatically returned to off position when the low flame control switch 24 is on. This design of linkage switch 25 can easily be obtained from conventional techniques.

[0027] The operation of the present invention is outlined hereinafter with reference to FIG. 4. When in use, the power switch 21 is pressed on to electrically connect the electronic igniter 9 to the common contact of the micro-switch 45, and then the cock 4 is rotated to open the passage of the valve seat 3, enabling fuel gas to pass through the gas inlet 33 into the first pressure chamber 58 of the pressure differential device 5 and then to the second pressure chamber 59 via the normal-open valve 53. At the same time, the actuating strip 46 of the micro-switch 45 is lowered to electrically connect the electronic igniter 9, causing the normal-close valve 54 to open, for enabling fuel gas to pass from the second pressure chamber 59 through a gas pipe 83 to an ignition flame nozzle 84 for burning by sparks discharged from an ignition plug 85 to provide the necessary ignition flame. A sensor 86 is provided to detect the presence of the ignition flame. After ignition of the ignition flame, a sensor 86, the sensor 86 outputs a signal to the electronic igniter 9 and the normal-open valve 53, causing the electronic igniter 9 to stop the ignition plug 85 from discharging sparks and the normal-open valve 53 to move from the open position to the close position to stop fuel gas from passing to the second pressure chamber 9. At this stage, the pressure of the second pressure chamber 59 is smaller than the pressure of the first pressure chamber 58, therefore the rubber diaphragm 56 is forced to move toward the second pressure chamber 59, causing the valve 57 to open the output port 50 for letting fuel gas to pass through the internal fuel gas passage 35 of the valve seat 3 and the main gas pipe 81 to the burner flame nozzle tube 82 for burning by the ignition flame at the ignition flame nozzle 84 to warm the house. Because fuel gas is delivered through the output port 50, the maximum fuel gas flowrate is provided for producing a high intensity of flame at the burner flame nozzle tube 82. Because the cock 4 can be rotated to regulate the flowrate of fuel gas passing through, it regulates the intensity of the burner flame at the burner flame nozzle tube 82 when rotated.

[0028] The burner flame can also be regulated by means of operating the high flame control switch 22, the medium flame control switch 23, or the low flame control switch 24. As shown in FIG. 5, when pressing on the high flame control switch 22 under the presence of the burner flame, the normal-open valve 53 is energized to move from the open position to the close position to stop fuel gas from passing to the second pressure chamber 59. At this time, the pressure of the second pressure chamber 59 is gradually reduced due to continuous output of residual fuel gas from the second pressure chamber 59, thereby causing a pressure difference between the first pressure chamber 58 and the second pressure chamber 59. Therefore, the rubber diaphragm 56 is forced by the first pressure chamber 58 toward the second pressure chamber 59 to move the valve 57, causing the valve 57 to open the output port 50 for enabling fuel gas to pass through the main gas pipe 81 to the burner flame nozzle tube 82 for burning by the ignition flame at the ignition flame nozzle 84 to warm the house.

[0029] Referring to FIG. 6, when pressing on the medium flame control switch 23 under the presence of the burner flame, the medium flowrate control valve 6 is energized to move from the close position to the open position (i.e., to open the valve plug 62), for enabling fuel gas to pass through the medium flowrate control valve 6, the internal fuel gas passage 35 of the valve seat 3 and the main gas pipe 81 to the burner flame nozzle tube 82. At this time, the ignition flame is still maintained in presence, and the high flame control switch 22 and the low flame control switch 24 are automatically returned to off position to further open the normal-open valve 53 and to close the low flowrate control valve 7, enabling fuel gas to pass through the normal-open valve 53 to the second pressure chamber 59 to further balance the pressure between the first pressure chamber 58 and the second pressure chamber 59. When the first pressure chamber 58 and the second pressure chamber 59 are balanced, the spring 55 pushes the rubber diaphragm 56 back to its former position, thereby causing the valve 57 to close the output port 50 again, prohibiting fuel gas from passing through the output port 50 to the burner flame nozzle tube 82.

[0030] Referring to FIG. 7, when pressing on the low flame control switch 24 under the presence of the burner flame, the low flowrate control valve 7 is energized to move from the close position to the open position (i.e., to open the valve plug 63), for enabling fuel gas to pass through the low flowrate control valve 7, the internal fuel gas passage 35 of the valve seat 3 and the main gas pipe 81 to the burner flame nozzle tube 82. At this time, the ignition flame is still maintained in presence, and the high flame control switch 22 and the medium flame control switch 23 are automatically returned to off position to further open the normal-open valve 53 and to close the medium flowrate control valve 6, enabling fuel gas to pass through the normal-open valve 53 to the second pressure chamber 59 to further balance the pressure between the first pressure chamber 58 and the second pressure chamber 59. When the first pressure chamber 58 and the second pressure chamber 59 are balanced, the spring 55 pushes the rubber diaphragm 56 back to its former position, thereby causing the valve 57 to close the output port 50 again, prohibiting fuel gas from passing through the output port 50 to the burner flame nozzle tube 82.

[0031] Either the intensity of the burner flame is at the high, medium, or low level, the cock 4 can be rotated to regulate the flowrate of fuel gas so as to further adjust the intensity burner flame.

[0032]FIG. 9 shows a second embodiment of the gas burner of the present invention. According to this embodiment, a double valve 75 having two valve plugs is used instead of the normal-open valve 53 of the pressure differential device 5 of the aforesaid first embodiment of the present invention. The first valve plug 76 of the double valve 75 is normally opened and adapted to control the passage of fuel gas to the second pressure chamber 59. The second valve plug 77 is normally closed, and adapted to control the passage of fuel gas from the second pressure chamber 59 to the ignition flame nozzle 84. The normal-close valve 54 of the pressure differential device 5 controls the passage of fuel gas from the passageway 36 connected between the first pressure chamber 58 and the normal-close valve 54 to the ignition flame nozzle 84. Thus, when rotating the cock 4 to switch on the micro-switch 45 (see FIG. 10), the normal-close valve 54 is energized to move from the close position to the open position for enabling fuel gas to pass through the first pressure chamber 58, the passageway 36, and the normal-close valve 54 to the ignition flame nozzle 84. After the presence of the ignition flame, the sensor 86 outputs a signal to the electronic igniter 9, causing the first valve plug 76 of the double valve 75 to be moved to the close position to stop fuel gas from entering the second pressure chamber 59 and the second valve plug 77 of the double valve 75 to be moved to the open position to let residual fuel gas pass from the second pressure chamber 59 to the ignition flame nozzle 84. After discharging of residual fuel gas from the second pressure chamber 59 is pressure difference is produced between the first pressure chamber 58 and the second pressure chamber 59, thereby causing the rubber diaphragm 56 to move the valve 57 from the close position to the open position for enabling fuel gas to pass through the output port 50 to the burner flame nozzle tube 82 for burning by the ignition flame.

[0033] Similar to the aforesaid first embodiment of the present invention, the burner flame of this second embodiment of the present invention can be regulated through the high flame control switch 22, the medium flame control switch 23, or the low flame control switch 24. The respective conditions are shown in FIGS. 11, 12 and 13. The operation procedure of this second embodiment of the present invention is similar to the aforesaid first embodiment of the present invention.

[0034] In FIGS. 3 and 9, the positions of the pressure differential device 5, the medium flowrate control valve 6 and the low flowrate control valve 7 on the valve seat 3 are for easy understanding only, and not intended to limit their arrangement. Further, a receiver 26 and a remote controller 27 may be used instead of the switches 21˜24 shown in FIG. 2. The receiver 26 is installed in the body 8, and electrically connected to the electronic igniter 9 and the control unit 1. The remote-controller 27 is adapted to transmit radio signal to the receiver 26 to connect power supply from the electronic igniter 9 to the common contact of the micro-switch 45, and to control the on/off position of the normal-open valve 53 (or double valve 75), the medium flowrate control valve 6 and the low flowrate control valve 7.

[0035] Referring to FIG. 3, a temperature sensor is provided and adapted to detect the temperature of the assigned area (either inside the body 8 or outside the body 8), having electric contacts 29 respectively to the electronic igniter 9 and the linkage switch 25. When the temperature of the house surpasses a predetermined high level, the electric contacts 29 of the temperature sensor are electrically disconnected to cut off power supply from the high flame control switch 22, the medium flame control switch 23 or the low flame control switch 24, thereby causing the normal-open valve 53, the medium flowrate control valve 6 or the low flowrate control valve 7 to be returned to its former position to stop fuel gas from passing to the burner flame nozzle tube 82 (the ignition flame is still maintained in presence) and to extinguish the burner flame. When the temperature of the house drops below a predetermined low level, the electric contacts 29 of the temperature sensor are electrically connected to let power supply be transmitted to the high flame control switch 22, the medium flame control switch 23 or the low flame control switch 24, thereby causing the normal-open valve 53 to move to the close position, or the medium flowrate control valve 6 or the low flowrate control valve 7 to move to the open position, for enabling fuel gas to pass to the burner flame nozzle tube 82 for burning by the ignition flame to produce the desired burner flame. Alternatively, the electric contacts 29 of the temperature sensor can be connected between the electronic igniter 9 and the power switch 21 (see FIG. 9). The electric contacts 29 are electrically disconnected to cut off power supply from the electronic igniter and to further extinguish the burner flame and the ignition flame when the temperature of the house surpasses the predetermined high level. On the contrary, when the temperature of the house drops below the predetermined low level, the electric contacts 29 are electrically connected, and the electronic igniter 92 works.

[0036] The medium flowrate control valve 6 (or the low flowrate control valve 7) may be eliminated from the aforesaid first or second embodiment of the present invention with the pressure differential device 5 when keeping the medium flowrate control valve 6 (or the low flowrate control valve 7) in the structure for use to regulate the intensity of the burner flame, i.e., the gas burner can produce a high intensity of burner flame or medium (low) intensity of burner flame (see FIGS. 8 and 14). If the medium flowrate control valve 6 (or the low flowrate control valve 7) is eliminated, the relative medium flame control switch 23 (or low flame control switch 24) should be eliminated too.

[0037] A prototype of gas burner has been constructed with the features of FIGS. 1˜14. The gas burner functions smoothly to provide all of the features discussed earlier.

[0038] Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims. 

What the invention claimed is:
 1. A gas burner operating system comprising a control unit installed in the body of a gas burner and connected to an electronic igniter in the body of said gas burner, and an operating unit provided outside the body of said gas burner and respectively connected to said control unit and said electronic igniter, wherein: said control unit comprises a valve seat supported in the body of said gas burner, and a cock, a pressure differential device and a normal-close type medium flowrate control valve respectively supported in said valve seat, said cock being connected to an external gas source and adapted to regulate the flowrate of fuel gas passing through as well as to control a micro-switch, which controls the connection of power supply to said electronic igniter, said pressure differential device comprising a first shell and a second shell coupled to each other face-to-face, a normal-open valve supported in said second shell, a normal-close valve supported in said second shell and electrically connected to said electronic igniter, a rubber diaphragm positioned in between said first shell and said second shell and supported on a pressure spring, a diaphragm valve coupled to said rubber diaphragm, a first pressure chamber defined between said first shell and said rubber diaphragm, a second pressure chamber defined between said second shell and said rubber diaphragm, and an output port disposed in communication between said first pressure chamber and said valve seat for output of fuel gas, said diaphragm valve being adapted to close/open said output port; said operating unit comprises a power switch, and a linkage switch formed of a high flame control switch and a medium flame control switch, said power switch being connected to a common contact of said micro-switch and said electronic igniter, said micro-switch having a normal-open terminal connected said electronic igniter, said high flame control switch being electrically connected to said normal-open valve and adapted to close/open said normal-open valve, said medium flame control switch being electrically connected to said medium flowrate control valve and adapted to close/open said medium flowrate control valve.
 2. The gas burner operating system of claim 1 wherein said control unit further comprises a normal-close type low flowrate control valve, and said operating unit further comprises a low flame control switch linked to the high flame control switch and medium flame control switch of said linkage switch, said low flame control switch being electrically connected to said low flowrate control valve and adapted to close/open said low flowrate control valve.
 3. The gas burner operating system of claim 1 further comprising a temperature sensor electrically connected to said electronic igniter and said linkage switch and adapted to detect the temperature of a predetermined place and to control the operation of said electronic igniter and said linkage switch subject to the value of temperature detected.
 4. The gas burner operating system of claim 3 wherein said temperature sensor has electric contacts connected between said electronic igniter and said power switch.
 5. The gas burner operating system of claim 1 wherein said operating unit further comprises an indicator light connected to a battery power supply being connected to said electronic igniter, and a control circuit adapted to turn on said indicator light when the power of said battery power is low.
 6. The gas burner operating system of claim 1 wherein said operating unit further comprises a receiver installed in the body of the gas burner and electrically connected to said electronic igniter and said control unit, and a remote-controller adapted to transmit control signal to said receiver by radio to electrically connect said electronic igniter to the common contact of said micro-switch and to control on/off of said normal-open valve, said medium flowrate control valve and said low flowrate control valve.
 7. The gas burner operating system of claim 1 wherein said normal-open valve comprises a gas tube peripherally sealed with at least one O-ring for the passing of fuel gas; said medium flowrate control valve comprises a gas tube peripherally sealed with at least one O-ring for the passing of fuel gas, the gas tube of said medium flowrate control valve having an inner diameter smaller than the gas tube of said normal-open valve; said low flowrate control valve comprises a gas tube peripherally sealed with at least one O-ring for the passing of fuel gas, the gas tube of said low flowrate control valve having an inner diameter smaller than said medium flowrate control valve.
 8. The gas burner operating system of claim 1 further comprises wire gauze filter means respectively installed in said cock, said valve seat and said pressure differential device and adapted to remove solid matter from fuel gas passing through.
 9. A gas burner operating system comprising a control unit installed in the body of a gas burner and connected to an electronic igniter in the body of said gas burner, and an operating unit provided outside the body of said gas burner and respectively connected to said control unit and said electronic igniter, wherein: said control unit comprises a valve seat supported in the body of said gas burner, and a cock, a pressure differential device and a normal-close type medium flowrate control valve respectively supported in said valve seat, said cock being connected to an external gas source and adapted to regulate the flowrate of fuel gas passing through as well as to control a micro-switch, which controls the connection of power supply to said electronic igniter, said pressure differential device comprising a first shell and a second shell coupled to each other face-to-face, a double valve supported in said second shell, a normal-close valve supported in said second shell and electrically connected to said electronic igniter, a rubber diaphragm positioned in between said first shell and said second shell and supported on a pressure spring, a diaphragm valve coupled to said rubber diaphragm, a first pressure chamber defined between said first shell and said rubber diaphragm and disposed in communication with said normal-close valve for enabling fuel gas to pass from said first pressure chamber to said normal-close valve, a second pressure chamber defined between said second shell and said rubber diaphragm, said double valve comprising a normally opened first valve plug adapted to control intake flow of fuel gas into said second pressure chamber, said a normally closed second valve plug adapted to control the passage of fuel gas from said second pressure chamber to an ignition flame nozzle of the gas burner, and an output port disposed in communication between said first pressure chamber and said valve seat for output of fuel gas, said diaphragm valve being adapted to close/open said output port; said operating unit comprises a power switch, and a linkage switch formed of a high flame control switch and a medium flame control switch, said power switch being connected to a common contact of said micro-switch and said electronic igniter, said micro-switch having a normal-open terminal connected said electronic igniter, said high flame control switch being electrically connected to said normal-open valve and adapted to close/open said normal-open valve, said medium flame control switch being electrically connected to said medium flowrate control valve and adapted to close/open said medium flowrate control valve.
 10. The gas burner operating system of claim 9 wherein said control unit further comprises a normal-close type low flowrate control valve, and said operating unit further comprises a low flame control switch linked to the high flame control switch and medium flame control switch of said linkage switch, said low flame control switch being electrically connected to said low flowrate control valve and adapted to close/open said low flowrate control valve.
 11. The gas burner operating system of claim 9 further comprising a temperature sensor electrically connected to said electronic igniter and said linkage switch and adapted to detect the temperature of a predetermined place and to control the operation of said electronic igniter and said linkage switch subject to the value of temperature detected.
 12. The gas burner operating system of claim 11 wherein said temperature sensor has electric contacts connected between said electronic igniter and said power switch.
 13. The gas burner operating system of claim 9 wherein said operating unit further comprises an indicator light connected to a battery power supply being connected to said electronic igniter, and a control circuit adapted to turn on said indicator light when the power of said battery power is low.
 14. The gas burner operating system of claim 9 wherein said operating unit further comprises a receiver installed in the body of the gas burner and electrically connected to said electronic igniter and said control unit, and a remote-controller adapted to transmit control signal to said receiver by radio to electrically connect said electronic igniter to the common contact of said micro-switch and to control on/off of said normal-open valve, said medium flowrate control valve and said low flowrate control valve.
 15. The gas burner operating system of claim 9 wherein said normal-open valve comprises a gas tube peripherally sealed with at least one O-ring for the passing of fuel gas; said medium flowrate control valve comprises a gas tube peripherally sealed with at least one O-ring for the passing of fuel gas, the gas tube of said medium flowrate control valve having an inner diameter smaller than the gas tube of said normal-open valve; said low flowrate control valve comprises a gas tube peripherally sealed with at least one O-ring for the passing of fuel gas, the gas tube of said low flowrate control valve having an inner diameter smaller than said medium flowrate control valve.
 16. The gas burner operating system of claim 9 further comprises wire gauze filter means respectively installed in said cock, said valve seat and said pressure differential device and adapted to remove solid matter from fuel gas passing through. 